Zhuzhou Century Tool CNMG Turning Inserts are engineered for stable and efficient external turning applications, combining advanced carbide substrates, optimized coating technology, and AG™ Adaptive Geometry chip control technology.
Unlike conventional inserts designed mainly for high-rigidity premium CNC machines, Century AG™ CNMG inserts are developed for real production environments where machine rigidity, cutting conditions, and operator parameters may vary.
With optimized cutting edge preparation, stable chip control, and a wide machining window, CNMG inserts provide reliable performance for steel turning, alloy steel machining, stainless steel applications, and general engineering components.
CNMG inserts are one of the most widely used ISO standard negative rake turning inserts for CNC lathes.
The CNMG designation represents:
| Code | Meaning |
|---|---|
| C | 80° Diamond Shape |
| N | 0° Clearance Angle (Negative Insert) |
| M | Standard Tolerance |
| G | Hole and Chip Groove Design |
CNMG inserts feature a strong 80° cutting edge design, making them suitable for general turning, facing, profiling, and heavy machining operations.
The double-sided negative geometry provides excellent edge strength and cost efficiency, making CNMG inserts a preferred choice for high-volume machining industries.
Many cutting inserts are developed and tested under ideal machining conditions with high-rigidity CNC equipment.
However, thousands of manufacturers worldwide operate:
Medium-rigidity CNC lathes
Older CNC machines
Mixed machine conditions
Variable cutting parameters
Different operator settings
Century AG™ was developed specifically for these real-world machining environments.
Optimized chip breaker geometry provides stable chip control across a wider range of:
Cutting speeds
Feed rates
Depth of cut
This reduces problems such as:
Long continuous chips
Chip entanglement
Unstable cutting
AG™ geometry reduces unnecessary cutting resistance through optimized rake design and chip flow control.
Benefits:
Reduced vibration
Better surface finish
Improved machining stability
Longer tool life on medium-rigidity machines
Optimized edge preparation improves resistance against:
Edge chipping
Interrupted cutting impact
Sudden load changes
Century Tool provides different AG™ geometries according to machining requirements.
| Geometry | Application | Recommended Operation |
|---|---|---|
| AG-U Universal | General steel machining | Medium turning |
| AG-H Heavy Cutting | Rough machining | Large depth of cut |
| AG-F Finishing | Precision turning | Light cutting |
| AG-S Stainless Steel | Stainless machining | Low work-hardening materials |
CNMG carbide inserts are suitable for a wide range of industrial materials.
Applications:
Carbon steel
Alloy steel
Structural steel
Forged components
Automotive parts
Typical materials:
45 steel
40Cr
42CrMo
AISI 1045
AISI 4140
SCM440
Applications:
Stainless shafts
Flanges
Valves
Food equipment components
Typical materials:
304 stainless steel
316 stainless steel
Duplex stainless steel
Applications:
Engine parts
Machine bases
Hydraulic components
Typical materials:
Gray cast iron
Ductile iron
| Grade | Main Application | Characteristics |
|---|---|---|
| CT2525 | General steel turning | Balanced wear resistance and toughness |
| CT3525 | Heavy cutting | High impact resistance |
| CT1525 | Finishing | Higher hardness and surface quality |
| CT3015 | Stainless steel | Improved toughness and chip resistance |
| Parameter | Recommended Range |
|---|---|
| Cutting Speed (Vc) | 160-320 m/min |
| Feed (f) | 0.12-0.40 mm/rev |
| Depth of Cut (ap) | 0.8-4 mm |
| Parameter | Recommended Range |
|---|---|
| Cutting Speed (Vc) | 140-280 m/min |
| Feed (f) | 0.15-0.35 mm/rev |
| Depth of Cut (ap) | 1-4 mm |
| Parameter | Recommended Range |
|---|---|
| Cutting Speed (Vc) | 100-220 m/min |
| Feed (f) | 0.10-0.30 mm/rev |
| Depth of Cut (ap) | 0.5-3 mm |
Century Tool supplies standard CNMG insert dimensions including:
| Insert Model | Nose Radius | Application |
|---|---|---|
| CNMG120404 | R0.4 | Finishing |
| CNMG120408 | R0.8 | General machining |
| CNMG120412 | R1.2 | Heavy machining |
| CNMG160608 | R0.8 | Large components |
Custom sizes and OEM production are available according to customer requirements.
| Feature | Conventional Insert | Century AG™ CNMG |
|---|---|---|
| Chip Control | Limited machining range | Wide chip control window |
| Cutting Stability | Sensitive to parameters | More stable |
| Machine Requirement | Higher rigidity needed | Suitable for medium-rigidity CNC machines |
| Application Range | Specific conditions | General production machining |
CNMG turning inserts are widely used in:
Automotive components
Hydraulic equipment
Oil and gas parts
General mechanical manufacturing
Heavy equipment
Railway components
Mold and die industries
Energy equipment
CNMG inserts are mainly used for external turning, facing, profiling, and rough machining on CNC lathes.
CNMG carbide inserts can machine steel, alloy steel, stainless steel, cast iron, and various industrial materials depending on grade and geometry selection.
CNMG inserts have an 80° diamond shape with higher edge strength, while WNMG inserts have a trigon shape offering more cutting edges and flexibility.
For 42CrMo machining, a medium geometry such as AG-U with CT2525 grade is recommended for general turning applications.
Long chips are usually caused by incorrect chip breaker selection, unsuitable feed rate, or improper cutting parameters. Choosing the correct AG™ geometry can improve chip control.
Explore more Century Tool cutting solutions:
WNMG Turning Inserts
TNMG Turning Inserts
DNMG Turning Inserts
Carbide Threading Inserts
Carbide Grooving Inserts
CNC Turning Tool Holders
Looking for a reliable CNMG insert supplier for CNC turning applications?
Contact Zhuzhou Century Tool for:
CNMG standard inserts
OEM carbide inserts
Customized chip breaker design
Application testing support
Century AG™ — Designed for Real-World Machining.
